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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82d748ec8257e389a0166ca0c07954b6f53a59e43836b58668eb9cc5011d6cc9' 
  AND token = 'tA73CZyNs54AUmBB139XZMaWat4baYUz05eCzGfpefA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}